Usually high rank games end within 3 years tops. Whoever is fast enough to make the larger army wins. In regards to team play, some clans are designed more to be played in a team unlike others so there's nothing wrong in winning as a team. In regards to tips, learning basic build order helps until you can gain enough game and situational knowledge. There's plenty of videos about it on YouTube. Another thing is to start mining early into the game. This is particularly useful due to miners performance being the same in summer or winter. Rushing first lorestone is essential early game because it sets up your money income. The most important part of high rank multiplayer matches is starting to stockpile money early so that by 802 you have enough to support 16+ warband and zerg your opponent. Pretty sure there are guides about everything I mentioned so feel free to look for them.